Research on inter-layer temporary plugging steering process technology for shale reservoirs

Abstract:

In response to the characteristics of Daqing Gulong Shale-type reservoirs such as rich phyllite， low horizontal permeability and inability to flow in the vertical direction， it is necessary to increase the pure pressure by temporary plugging steering fracturing technology. The degree of fracture complexity is further increased using the temporary particles to seal the borehole and force the fracturing fluid to turn. This paper analyzes the force and pressure changes of temporary plugging particles in the wellbore and near the shot-holes before and after temporary plugging， proposes the equation of motion of the temporary plugging particles， establishs two parameters to evaluate the setting effect of temporary plugging particles， sets the standard to evaluate the temporary plugging steering， develops the dosage design method of temporary plugging particles， and studies the sealing effect of temporary plugging particles in the process of fracturing construction for horizontal wells in shale oil test area. The field test results show that the efficiency of temporary plugging reached 66.7%， the setting efficiency reached 74% and the temporary plugging particle efficiency reached 34%. The fracture initiation position or extensive direction is obviously different after temporary plugging， the shot-hole sealing is effective， and the purpose of fracture steering is realized， which provides theoretical support for the future work of fracturing for shale oil reservoirs.